Aromatic amino acids and esters thereof

ABSTRACT

Amino acids and their derivatives of the formula:   PHENYL, PYRIDYL, HALOPHENYL, HALOPYRIDYL, LOWER ALKYLPHENY   LOWER ALKYLPYRIDYL, LOWER ALKYLOXYPHENYL, LOWER   ALKYLOXYPYRIDYL, TRIFYLOROMETHYLPHENYL,   TRIFLUOROMETHYLPYRIDYL; R2 is CONH2 provided that R1 is   hydrogen, and R1 + R2 together with the nitrogen atom to w   they are attached are morpholinyl, pyrrolidinyl, piperidyl   indolinyl or isoindolinyl; or   WHEREIN X is hydrogen or halogen, R is HYDROXYL LOWER ALKYLOXY,   These compounds possess anorezigenic, analgesic and lipid   metabolism regulating properties.   PHENYL, PYRIDYL, HALOPHENYL, HALOPYRIDYL, LOWER ALKYLPHENYL, LOWER ALKYLPYRIDYL, LOWER ALKYLOXYPHENYL, LOWER ALKYLOXYPYRIDYL, TRIFYLOROMETHYLPHENYL, TRIFLUOROMETHYLPYRIDYL; R2 is CONH2 provided that R1 is hydrogen, and R1 + R2 together with the nitrogen atom to which they are attached are morpholinyl, pyrrolidinyl, piperidyl, indolinyl or isoindolinyl; or   These compounds possess anorezigenic, analgesic and lipid metabolism regulating properties.

United States Patent 1 Beregi et al.

[ 1 3,759,979 Sept. 18, 1973 AROMATIC AMINO ACIDS AND ESTERS THEREOF [75] inventors: Laszlo Beregi, Boulogne S/Seine;

Pierre llugon, Rueil-Malmaison; Jean-Claude LeDouarec, Suresnes, all of France [73] Assignee: Science Union et Cie, Suresnes,

France [22] Filed: Feb. 13,1970

[211 App]. No.: 11,330

[30] Foreign Application Priority Data Feb. 27, I969 Great Britain l0,6l7/69 [52] US. Cl 260/471 A, 260/247.2, 260/293.76, 260/296 R, 260/326.l, 260/326.l5,

260/326.3, 260/50l.l 1, 260/518 A, 260/553 A, 260/558 A, 260/558 H, 424/248, 424/262, 424/263, 424/267, 424/274, 424/309,

[51] Int. Cl. C07c'l0l/08 Y [58] Field of Search 260/518 A, 471 A, 260/501.ll

[56] References Cited UNITED STATES PATENTS 3,419,525 12/1968 Aelony ..260/5l8A Primary Examiner--Lorraine A. Weinberger Assistant Examiner-L. Arnold Thaxton AttorneyCifelli and Behr s7 ABSTRACT- Amino acids and their derivatives of the formula:

phenyl, pyridyl, halophenyl, halopyridyl, lower alkylphenyl, lower alkylpyridyl, lower alkyloxyphenyl, lower .alkyloxypyridyl, trifyloromethylphenyl, trifluoromethylpyridyl; R is CONl-l, provided that R is hydrogen, and R, R together with the nitrogen atom to which they are attached are morpholinyl, pyrrolidinyl, piperidyl, indolinyl or isoindolinyl; or

. a I V wherein R, and R4 are hydrogen or lower These compounds possess anorezigenic, analgesic and lipid metabolism regulating properties.

3 Claims, No Drawings AROMATIC AMINO ACIDS AND ESTERS THEREOF SUMMARY OF THE INVENTION The present invention provides amino acids and their derivatives of the general formula I Q-CHr-EH-NH-CHr-C O-R X Ha wherein X is selected from the group consisting of a hydrogen atom and a halogen atom such, for example, as a chlorine or a fluorine atom R is selected from the group consisting of l. a hydroxyl radical 2. a lower alkyloxy radical having from one to four carbon atoms inclusive tached, a heterocyclic radical selected from the group 1 consisting of a morpholinyl, pyrrolidinyl, piperidyl, indolinyl and isoindolinyl radical Rs I 4o aHN--N radical wherein R and R are the same or different and each is selected from'the group consisting of a hydrogen atom and a lower alkyl radical containing from I to 4 carbon atoms inclusive.

The compoundsof the general formula I are new and may be prepared by the following methods which are wherein X, R R R and R have the meanings given above.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The compounds of the present invention comprise compounds of general formulae IV, V, VII and IX above.

The alkyl group in compounds of general formula I may be lower alkyl such as methyl, ethyl, propyl, isopropyl, n-butyl, iso-butyl, tert butyl or the like.

In compound of general formula VII the group may be hydrogen or lower alkyl such'as methyl, ethyl, propyl or butyl and the like and R and R, may be the same or different.

In compounds of general formula IX the group R and R may be the same or different and may be hydrogen or lower alkyl such as methyl, ethyl, propyl, butyl or the like, where R or R are substituted phenyl or 4 substituted pyridyl, any carbon atom of the cyclic nucleus may be bonded to the nitrogen atom of the group similarly the substituents on the cyclic nucleus may be on in any remaining carbon atom thereof. These substituents include lower alkyl, such as methyl, ethyl, propyl, butyl and the like and lower alkoxy such as methoxy, ethoxy, propoxy, butoxy and the like.

The compounds of general formula IV are prepared by heating a solution of the appropriate compound of formula II with 0,5 mole of the appropriate haloacetate of formulalllper mole of compound of formula ll, in an anhydrous solvent. Either the bromo acetate or the chloroacetate may be used, however, a hydrocarbon solvent suitably an aromatic hydrocarbon such as benzene, toluene, xylene or the like are preferred. The mixture is heated under reflux for from about 3 to 6 hours, suitably for about 4 hours, the precipitated salt removed and the product isolated, preferably by fractional distillation.

The compounds of formula V are prepared by saponification of a corresponding compound of formula IV. it is preferred to carry out the saponification in the presence of a strong acid, preferably a mineral acid such as hydrochloric acid. The ester is saponified by heating under reflux with a large excess of acid. There may be used an excess of from about 30 to about 60 moles of acid per mole of ester. The amino acid thus produced is then isolated, (in the form of the acid salt) suitably by filtration, washed with water and dried.

The compounds of general formula VII are prepared by reacting a compound of formula [V with the appropriate hydrazine of general formula VI in a suitable solvent. There may be used from about 1 to about 10 moles of hydrazine, suitably 5 moles of compound per mole of ester of general formula IV. It is preferred to use a reaction inert polar solvent such as a lower alkanol for example, ethanol. It is preferred to carry out the reaction by heating, suitably under reflux for from about one-half to about 3 hours. The product is then isolated. In a suitable procedure the reaction mixture is evaporated to remove the solvent and the residue extracted in a similar, but anhydrous solvent. Since the compounds are most conveniently handled in the form of their salts, there may be added to the solvent an ethereal solution of a suitable acid, ether saturated with gaseous hydrogen chloride being especially preferred.

The compounds of general formula IX are prepared by reacting a compound of general formula [I with the appropriate haloacetamide of general formula VI". The reaction is carried out by adding 0,5 mole of the haloacetamide per mole of compound of formula II. There is utilized a reaction inert solvent, suitably a hydrocarbon solvent preferably an aromatic solvent such as toluene, benzene or xylene.

After addition is complete, the mixture is heated under reflux for from about 8 to about 18 hours suitably for about 10 hours and the product isolated. In the preferred mode of isolation the cooled reaction product is filtered and the filtrate evaporated to remove the solvent. The residue is then isolated, suitably in the form of an acid salt. In one procedure the residue is taken up in an alkanol, such as isopropanol containing the acid, such as methane sulfonic acid, from which the product is isolated as the methane sulfonate in the usual manner.

The invention also includes within its scope the separation of the optical isomers.

The compounds of the general formula I, wherein R represents a hydroxyl radical, may be converted into addition salts with mineral or organic bases such, for example, as alkaline or alkaline earth metals hydroxides and usual amines. The compounds of the general formula I, wherein R has the other above mentioned meanings, may be converted into addition salts with mineral or organic acids such, for example, as hydrochloric, hydrobromic, sulfuric, phosphoric, sulfamic acids as mineral acids, and acetic, propionic, maleic, fumaric, tartaric, citric, oxalic, methane sulfonic, benzoic, anthranilic acids as organic acids. All these salts are also included in the present invention.

The new compounds of the present invention and their physiologically tolerable addition salts possess valuable pharmacological and therapeutic properties.

The anorexigenic activity was studied in the rat and in the dog. It was observed that the food intake of the .rat was reduced by 21 to 2 hours after administering the products at the dose of 2,5 to 20 mg/kg P.O. The food intake of the dog was reduced by 50% with the dose of 5 to 10 mg/kg in the same conditions.

The analgesic activity was demonstrated by the Haffner method [DMW 55, 731, (1929)]. The active dose was found to be in the range of from 12,5 to 40 mg/kg LP. for the different compounds of the invention.

An activity of these compounds on lipid metabolism was also observed. It was found that doses of 10 to 15 mg/kg administered by the oral route induced in the rat an increase of 40 to 50% of the plasmatic free fatty acids (F.F.A.). Administered for 10 days to the rat at doses of IO to 30 mg/kg P.O., it was noted a reduction of 25 to 50% of the epididymal fat in comparison with the untreated animals.

The here-above described properties, as well as the low toxicity, allow the use of the new compounds of the invention in therapy, especially in the treatment of obesity and pain.

The present invention also provides pharmaceutical compositions comprising a compound of the general formula I or a physiologically tolerable salt thereof in admixture or conjunction with a suitable pharmaceutical carrier such, for example, as distilled water, glucose, lactose, talc, starch, magnesium stearate, cocoa butter etc These pharmaceutical compositions may be administered by the oral, rectal or parenteral route at doses of 10 to 200 mg, l to 5 times a day.

The following Examples illustrate the invention, the parts being by weight and the melting points being determined on a Kofler bank unless otherwise stated.

Example 1 Ethyl [l-(3-trifluoromethyl phenyl) prop-2-yl]- amino acetate -o1r=oa-un-cm0 o o-cm-cm Examples 2-5 The following compounds were prepared according to the method described in Example 1 2. Ethyl [1-(2-trifluoromethyl phenyl) prop-2-y11- amino acetate, B.P./O.25mm Hg 97100 C, starting from ethyl bromo acetate and 1-(2-trif1uoromethyl phenyl)-2 amino propane. 3. Ethyl [1-(3-trifluoromethyl-4-chloro phenyl) prop- 2-yll-amino acetate, B.P./0.35 mm Hg 124-126 C, M.P. (hydrochloride) 168 C (isopropanol), starting from ethyl bromo acetate and 1-(3-trifluor0methy1-4' chloro phenyl)-2 amino propane. 4. Methyl [1-(3-trifluoromethyl phenyl) prop-2-y1]- amino acetate, M.P. (hydrochloride) 215-218 C (isopropanol), starting from methyl bromo acetate and 1- (3-trifluoromethyl phenyl)-2 amino propane. 5. Propyl [1-(3-trifluoromethyl phenyl) prop-2-yl]- amino acetate, M.P. (hydrochloride) 198 C (isopropanol), starting from propyl bromo acetate and l-(3- trifluoromethyl phenyl)-2 amino propane.

Example 6 N-[ l-(3-trifluoromethyl phenyl) prop-2-yl] glycine FsC A mixture of 20 parts of ethyl [1-(3-trifluoromethyl phenyl) prop-2-y1]-amino acetate hydrochloride and 300 parts of concentrated hydrochloric acid ((1 1.19) was refluxed for 3 hours. The crude product was collected by filtration, washed with 100 parts of water and dried. There were obtained 16 parts of N-[l-(3- trifluoromethyl phenyl) prop-Z-yl] glycine hydrochloride, M.P. 200C with decomposition.

Examples 7 8 The following compounds were prepared according to the method described in Example 6. 7. N-[ l-(Z-trit'luoromethyl phenyl) prop-2-yl] glycine, M.P. (hydrochloride) 203-205C with decomposition (water), starting from ethyl [1-( 2-trifluoro-methyl phenyl) prop-2-y11-amino acetate hydrochloride and hydrochloric acid. 8. N-[1-(3-trifluoromethyl-4-chloro phenyl) prop-2-yl] glycine, M.P. (hydrochloride) 207-208C. (diluted hydrochloric acid), starting from ethyl [1-(3- trifluoromethyl-4-chlorophenyl) prop-2-yl1-amino acetate hydrochloride and hydrochloric acid,

Example 9 N-methy1[1-(3-trif1uoromethyl phenyl) prop-2-yl1- amino acetamide FaC To a solution of 40.6 parts of l-(3-trifluoromethyl phenyl)-2-amino propane in 150 parts of anhydrous benzene there were added 10.8 parts of N-methyl chloro acetamide. The addition required ten minutes and the reaction mixture was then refluxed for 10 hours.

The hydrochloride of the starting amine which separated was collected by filtration, the solvent was evaporated and the residue taken up by a mixture of 100 parts of isopropanol and 8.75 parts of methane sulphonic acid. The solid which separated was collected by filtration. It was crystallized from 300 parts of iso- 5 propanol to give 21 parts of N-methyl [1-(3-trifluoromethyl phenyl) prop-2-yl]-amino acetamide methane sulphonate.

Examples 10 22 The following compounds were prepared according to the method described in Example 9 10. N-methyl [1-(3-trifluoromethyl-4-chloro phenyl) prop-2-yl1-amino acetamide, M.P. (hydrochloride) 175-176C. (acetone), starting from 1-(3-trifluoromethy1-4-ch1oro phenyl)-Z-amino propane and N-methyl chloro acetamide. 11. N,N-dimethyl [1-(3-trifluoromethyl phenyl) prop- 2-yl]-amino acetamide, M.P. (hydrochloride) 224-226C. (isopropanol), starting from 1-( 3-trifluoromethyl-phenyl)-2-amino propane and N, N-dimethyl chloro acetamide. 12. [l-(3-trifluoromethyl phenyl) prop-Z-yll-amino acetamide, M.P. 74-75C. (cyclohexane) starting from 1-(3-trifluoromethyl phenyl)-Z-amino propane and chloro acetamide. 13. 1-{[1-(3-trifluoromethyl phenyl) prop-Z-yll-amino acetyl) indoline, M.P. (hydrochloride) 260C (methanol), starting from 1-(3-trifluoromethyl phenyl-2- amino propane and l-(chloro acetyl) indoline. 14. N-pyrid-2-y1-{ l-(3-trifluoromethyl phenyl) prop-2- yll-amino acetamide, M.P. (hydrochloride) 230232C (water), starting from l-(3-trifluoromethy1 phenyl)-2- amino propane and N-pyrid-Z-yl chloro acetamide. l5. N-carbamoyl [1-(3-tritluoromethyl phenyl) prop-2- yll-amino acetamide, M.P. 116-117C. (ethanolwater), starting from 1-(3-trifluoromethylphenyl)-2- amino propane and chloroaeetyl urea.

16. N-(4-ch1oro phenyl) 1-(2-fluoro-4-trifluoromethyl phenyl) prop-2-yll-amino acetamide, starting from l (2-fluoro-4-trifluoromethyl phenyl)-2-amino propane and N-(4-ch1oro phenyl)-chloro acetamide. 17. N-(3-methoxy phenyl) [1-(3-chloro- 4trifluoromethyl phenyl) prop-2-yl1-amino acetamide, starting from 1-(3-chloro-4-trifluoromethy1 phenyl)-2- amino propane and N-(3-methoxy phenyl) chloro acetamide. 18. N-(4-methyl pyrid-2-y1) [1-(2-trifluoromethyl phenyl) prop-2-y11-amino acetamide, starting from 1-(2- trifluoromethyl phenyl)-2-amino propane and N-(4- methyl pyrid-2-yl)-chloro acetamide. 19. 1- l-(3-trifluoromethyl phenyl) prop-Z-yll-amino acetyl piperidine, M.P. (hydrochloride) 218-219C. (isopropanol) starting from 1-(3-trifluoromethyl phenyl)- 2-amino propane and N-chloro acetyl piperidine. 20. N-(3trifluoromethy1 phenyl) ['1-(3-trifluoromethy1 phenyl) prop-2-y11-amino acetamide, M.P. (methane sulphonate) 220C. (ethanol), startingfrom 1-(3-trifluoromethylphenyl)-2-amino propane and N-(3- trifluoromethyl phenyl)-chloro acetamide. 21. 4- ([(3-trifluoromethyl-4-fluoro phenyl) prop-2- yl]-amino acetyl} morpholine, starting from 1-(3-trifluoromethy1-4-fluoro phenyl)-2-amino propane and N-chloroacetyl morpholine. 22. 1-{ [1-(2-ch1oro-4-trifluoromethyl phenyl) prop-2- yll-amino acetyl pyrrolidine, starting from 1-(2-chloro-4-trif1uoromethyl phenyl)-Z-amino propane and N-chloroacetyl pyrrolidine.

Example 23 [I-(B-trifluoromethyl phenyl) prop-Z-yll-amino acetyl hydrazine To 25 parts of hydrazine hydrate (98%) in 250 parts of ethanol there were added, during 10 minutes, 29 parts of ethyl [l-(3-trifluoromethyl phenyl) prop-2-yl)- amino acetate. The mixture was refluxed for one hour.

After evaporation of the solvent, the residue was taken up by 200 parts of anhydrous ethanol and an excess of hydrochloric ether. The salt separated in a well crystallized form was dried; 30 parts of l-(3-trifluoromethyl phenyl) prop-2-yl1-amino acetyl hydrazine dihydrochloride, M.P. l72-173C (Micro Kofler) were obtained.

Example 24 The following example was prepared according to the method described in Example 23 N-methyl-N'- {[l-(3-fluoro-4-trifluoromethyl phenyl) prop-2-yl1-amino acetyl hydrazine, starting from ethyl [l-(3-fluoro-4-trifluoromethyl phenyl)prop-2-yl I- amino acetate and N-methyl hydrazine.

We claim LA compound selected from the group consisting of:

A. Aromatic amino acids and their esters of the general formula I:

Dom-on-mm-cmcoaz UNITED .STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent No. 3,759,979 Dated S pt. 18, 1973 Invent0r(s) Laszlo Beregi, Pierre Hugon, Jean-Claude LeDouarec It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

Column 1, lines 20 to 24, delete entire substance,

insert the following:

wherein R and R are the same or different and each.

lines 38 to 44, delete entire substance, insert the following:

4. a radical of the formula:

R HNN/-3 wherein R and R are the same or different.

line 60, insert (n l, 2, 3 or 4) Signed and sealed this 15th day of April 12375.

("A 1 44.94;- Attest:

C. 115133213111, DAN? 1! 7-," f\ 1. (1 A J ..Un. a. ..nouh Comttnssroner of ratents zittesti n Officer ant Trademarks ORN PO-lOSO (IO-69) USCOMM-DC 60376-969 \Ll. oovnunm PIIIIY'IG onlcl I!" o-tu-lu 

2. A compound of claim 1 which is ethyl(1-(3-trifluoromethyl phenyl) prop-2-yl)-amino acetate
 3. A compound of claim 1 which is N-(1-(3-trifluoromethyl phenyl) prop-2-yl)-glycine. 